Si-the Atrp-based Preparation Of Inorganic / Organic Nanocomposite Microsphere Material

In recent years, more and more researchers paid attention to inorganic/organic nanocomposites. The inorganic nanomaterials have a larger surface area and the relatively strong interfacial interaction, so the thermal properties, mechanical properties, electrical properties, optical properties and magnetic properties of the nanocomposites are different from the general composites. At the same time, the inorganic/polymer composite nanomaterials have many advantages compared with the inorganic nanomaterials, such as environmental responsible, environmental friendly properties and biocompatiblities. The surface-initiated atom transfer radical polymerization (SI-ATRP) is one of the most popular methods of preparation of inorganic/polymer nanocomposites. While organic halide was modified on the nanomaterials' surface as the surface initiator and transition metal complexes were used as a carrier of halogen atoms, the controllable polymerization on the surface of the inorganic nanomaterials' could be realized through SI-ATRP method.Based on the studies above, nano-TiO2 and nano-Fe were used as substrates, and PDEAEMA(Poly(N, N-diethylamino ethyl methacrylate)) was modified on their surface separately. The PDEAEMA brushes were reacted with CH3I to form quaternized-PDEAEMA (Q-PDEAEMA) so as to facilitate exchange with noble metal anions, which was followed by in situ reduction to form the noble metal nanoparticles(Pt, Au, Pd) on the surface of nano TiO2. This thesis mainly includes the two parts as follows:1. The ethylene glycol and TBT(Tetra-n-butyl Titanate) reacted to obtain the precursor of titanium, and then further to obtain nano TiO2 powders. The reaction mechanism of obtaining nano TiO2 and the impact experimental factors of size and dispersion of nano TiO2 were investigated. Dopamine-based initiator was used to modify the surface of nano TiO2. The TiO2-g-PDEAEMA nanospheres were obtained via surface initiated atom transfer radical polymerization (SI-ATRP) both DEAEMA monomers and dopamine modified nano TiO2. The obtained PDEAEMA brushes were reacted with CH3I to form quaternized-PDEAEMA (Q-PDEAEMA) so as to facilitate exchange with noble metal anions, which was followed by in situ reduction to form the noble metal nanoparticles (Pt, Au, Pd) on the surface of nano TiO2. The results indicated that the nano TiO2 was anatase and the PDEAEMA was grafted on the surface of nano TiO2. The results of TEM and EDS indicated that noble metal nanoparticles (Pt, Au, Pd) were doped on the surface of nano TiO2. UV results indicated that the absorbance of TiO2-g-PDEAEMA after doping noble metal nanoparticles had some changes. 2. After forming Fe3O4 on the surface of nano Fe via treatment of passivation, dopamine-based initiator was modified on the surface of the Fe3O4. Fe-g-PDEAEMA nanospheres were obtained via surface initiated atom transfer radical polymerization (SI-ATRP), both DEAEMA monomers and dopamine modified nano Fe. The results indicated that the surface of nano-Fe contained Fe3O4 after treatment of passivation, the PDEAEMA was grafted on the surface of nano-Fe, the dispersion of Fe-g-PDEAEMA nanospheres was very good, and subsidence dynamics data of Fe-g-PDEAEMA nanospheres indicated that Fe-g-PDEAEMA has pH sensitivities.